1 Minutes of LERe C Beam Line Status
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Minutes of LERe. C Beam Line Status Meeting 3 September 2015 Beam Line Layout – Cooling Section (CS) • Mu Metal shield design – G. Mahler is assembling a mock-up of beam line for field measurements to evaluate effectiveness of shield design based on worst case penetrations of the shield. This setup will include routing of BPM cables, 4 holes needed for mounting of LF solenoid, beam pipe supports, and holes for various types of stands. • Power Supplies for Cooling Section magnets (PS Layout) provided by D. Bruno. Correctors (from NSLSI) near triplet need to be included. Instrumentation • Std. Profile Monitor: Wedge’ viewport window – Order has been placed w/Kurt Leskar • Hybrid BPM: BPM Hybrid design – need housing detail drawing to send to MPF. T. Miller to provide slit width. • Wire Scanner: TM suggested ordering this device from Cornell. • NMR magnetic field sensor with integrated Hall probe and temperature sensor to be installed in 180 dipole. It must be able to slide in and out. Also, support for camera required. Low Energy RHIC electron Cooling
Minutes of LERe. C Beam Line Status Meeting 3 September 2015 Magnets: • Field testing of first LF (Compensating) Solenoid has been completed, and testing continues on next 4. Also, 5 more solenoids have been recently delivered for a total of 10. The 1% accurate Hall probe has been delivered. • 20 degree dipole (Everson Tesla). GM to get updates status report on delivery. • HF Solenoids supplied by Buckley were due for Shipment 8/31/2015. GM to call for status. RF Cavities: Meetings for warm RF cavities are ongoing. • 2. 1 MHz Cavity procurement package being prepared. • Detail design can start on 704 MHz (S. Picataggio) Other, Component Stands: • 180 Dipole - K. Hamdi has developed layout of stand, but will hold off for now on doing the detail drawings due to unknowns. Sliding design not required if energy recovery design is not used. Hybrid BPM’s move in Z with magnet, and move independently in X and Y. • 20 dipole stand design is done, not quite ready for checking yet. (There are 2 stand configurations for these magnets). Energy recovery design: Per M. Blaskiewicz there will not be enough intensity for cooling without the 5 -cell cavity. With the ERL 5 -cell the schedule for commissioning will be 5 months. Using the Niowave 5 -cell (if possible) will be high cost ($2 M). Low Energy RHIC electron Cooling
Overall Layout 64 m H & V Correctors IP 2 LERe. C-I (1. 6 -2 Me. V): Gun to dump SRF gun used as a booster cavity Add Quad and Skew Quad Correctors Move BPM close to 180 magnet combine with PM. Add Quad and Skew Quad Correctors Low Energy RHIC electron Cooling
PS Layout Phase 1 Low Energy RHIC electron Cooling
PS Layout Cooling Section Low Energy RHIC electron Cooling
180 o Dipole Magnet Neighborhood IV BPM + YAG + Slit Assemblies PROFILE MONITOR ± 4. 13” HIGH FIELD SOLENOID LOW FIELD SOLENOID H/V Corrector BPM YELLOW RHIC Beam PROFILE MONITOR EMITTANCE SLIT BLUE RHIC Beam BPM Quad/SQ Corrector kh
See slide #2 YELLOW RHIC Beam BLUE RHIC Beam 20 o Dipole Neighborhood IV ERL, Profile Monitor ID=1. 87” BPM PROFILE MONITOR EMITTANCE SLIT HIGH FIELD SOLENOID Cornell, Wire Scanner OD=1. 50” ; ID=1. 38’’ Quad/SQ CORRECTOR BPM w/ ERL Buttons ID=2. 37” YELLOW RHIC Beam BLUE RHIC Beam kh PROFILE MONITOR TRANSPOR T SOLENOID 20° DIPOLE
BPMs in Cooling Section (14 Locations) Large Dia. BPM Housings (4. 8 ID), 28 mm buttons • Order Placed with MPF • Final Design Review 6/23/2015, no issues • MPF approved to start fabrication • Increased number of button first articles for 2 BPM’s one standard, one 180 magnet special • MPF updated delivery schedule • Agreed on vacuum bakeout for components MPF will vacuum bake buttons @900 C/1 hr during brazing MPF will vacuum bake housing @450 C/48 hr BNL will vacuum bake 1 st article housing • First Article delivery buttons 9/12/2015 • First Article delivery housing 10/01/2015 Low Energy RHIC electron Cooling
Cooling Section Standard Profile Monitors RF impedance design approved (Peter T. ) Ferrite ring mounting design complete. CMD 5005 material. Requisition for commercial vacuum linear stage, requisition complete YAG screen/mirror holder design complete. Fabrication drawings for YAG screen/mirror holder and vacuum chamber. Update design for ground fingers. Stage Assembly (Linear Feedthrough) Zero Length adapter flange Profile Monitor YAG Screen Assy. Low Energy RHIC electron Cooling
Cooling Section “hybrid” BPM, Slit RF impedance analysis complete Chamber design complete Need approved fabrication drawing (CO with MPF? ) Design of RF impedance grounding fingers defined Design of RF impedance ferrite configuration and mounting Low Energy RHIC electron Cooling
Cooling Section PM meeting Notes: • Mirror thickness specified • Both Hybrids PM, Slit, BPM systems will be 3 position vacuum translating stage drives. The second hybrid will substitute the slit position (which is not needed) for a fault study beam stop. • Dan transverse position accuracy of the vacuum translating stage – will order 2 and measure. • Angle mount windows ordered (7 units). • The windows will be coated with a thin metallic coating by the vendor (KL). • The Yag crystals will be coated with a thin metallic coating to dissipate charge. Dan Steski can do it. • CS has preliminary drawings for standard profile monitor for cost estimate. Need to update and check final drawings. • The grounding requirements for the hybrid head has been revised. Grounding fingers and mounting frame defined. • The standard profile monitor will be modified for grounding fingers in the inserted position. TBD • The emittance slits needs grounding fingers – New grounding finger hardware defined. Low Energy RHIC electron Cooling
Cooling Section Emittance Slits • • • Requisition for commercial vacuum linear stage. Fabrication drawings complete and approved. Central Shops requisition approved for vacuum chamber and W slit. The slit needs to be grounded at the vacuum chamber when scanning. Delivery dates: shifter, vacuum chamber, W slit, mounting hardware. Low Energy RHIC electron Cooling
Vacuum Hardware Beam line bellows & 180 accordion bellows purchase orders. “Standard Chamber Length” defined – NEG coating underway 180 chamber 316 L vacuum annealed to 900 C after welding. 180 chamber in shops, 20 chamber in shops – 2 only Test chamber welded and measured. Shielded valves on order DC Gun shielded valves and vacuum equipment. Low Energy RHIC electron Cooling
20 o Dipole Magnet Requisition approved SOW – 2 magnets by 10/1/2015. Order Placed 5/6/2015 Everson Tesla Estimated Delivery 1 st two magnets 10/1/2015 Distance Between Pole Faces = 10. 4 cm (4. 1 in. ) Magnet Vertical Gap = 10 cm Vacuum Chamber V Aperture = 9. 5 cm (3. 74 in. ) Low Energy RHIC electron Cooling
180 o Dipole Magnet Revised 16
180 o Dipole Magnet Revised Low Energy RHIC electron Cooling
Compensating and Matching Solenoids Buckley magnets complete 8/20/2015? ? + 6 weeks shipping + customs. Alpha Magnetics update: 1 st production magnet + 4 more in house. Magnetic Measurement ordered and received 1% 3 D probe, 0. 1% received 9 2 2015. • Design support stand assembly – provide space for mu metal shields, separate beam pipe stand support. Fabricate Stands • Magnetic shielding analysis (Wuzheng). • Design prototype mu metal shields and supports - measure. Low Energy RHIC electron Cooling
Compensating and Matching Solenoids Feed the BPM cables through a common hole in the shielding for each BPM station (4 cables /hole). This will require a 90 degree type-N connector on the LDF 1 -50 Heliax cable (0. 37" OD) that connects to BPM button feedthrough connector. Would you have the design add the cables and connectors to the model and choose an appropriate place for the penetration, respecting the minimum cable bending radius? Low Energy RHIC electron Cooling
Compensating and Matching Solenoids HALL PROBE / SOLENOID GRANITE TABLE (Measurement Schedule) August 3 -7: complete permanent magnet measurements August 10 -14: August 17 -21: reconfigure Hall probe (Sullivan), then resurvey (Karl) August 24/25: Jain reviews survey data, first solenoid (Sauerwald) August 26 – Sept. 30: move solenoid granite table out of Annex October first solenoid complete, goal of 2 per week. Low Energy RHIC electron Cooling
Compensating Solenoids Measurement We have done a preliminary scan (on-axis only) to check out the measurement system and the results seem to be good in terms of magnet performance. We tuned the main coil and bucking coil currents to match the central fields expected from Wuzheng's calculations. An adjustment of about +2% had to be made to the design currents to get the design fields. The on-axis field drops below 1 Gauss level at approximately +/- 18 cm from the magnet center. This is a faster fall off than the +/- 21 cm expected. I am not sure if the earth's field of about 0. 2 Gauss is helping with this. The second field integral at the adjusted current settings comes out to be 4. 019 E-05 T^2. m, which meets the 4. 0 E-5 T^2. m requirement. Thanks, Animesh Low Energy RHIC electron Cooling
LERe. C Cooling Section Design Room LF & HF solenoid and 20 o dipole magnets fabrication drawings (KH) Beam Diagnostics: BPM chamber and buttons (VDM) Beam Line 5” bellows with shields fabrication drawings (GW) 20 o dipole vacuum chamber for impedence review (KH) 180 o dipole fabrication drawings (KH) Spectrometer magnet (180 o dipole) revisions (KH) 180 o vacuum chamber + large sliding bellows fabrication drawing (KH) Beam Diagnostics ES W slit & chamber fabrication drawings (VDM) 20 o dipole vacuum chamber fabrication drawings (KH) Cable tray and penetration drawings and excel sheet (AF) Beam Diagnostics: standard PM fabrication drawings (GW) Beam Diagnostics: special “hybrid” ES/PM/BPM fabrication drawings (GW) Beam line solenoid/BPM stands & vacuum chamber stand (VDM) Beam line magnetic shielding (VDM) 20 o magnet stand drawing (KH) 180 o magnet w/hybrid BPM stand drawings (KH) Magnetic shielding drawing and solenoid magnetic measurement test station HF dipole, quadrupole, and skew quadrupole corrector drawings Low Energy RHIC electron Cooling
LERe. C Design Room Source Design Work DC Gun Vacuum Chamber Fabrication Drawings (JH) DC Gun SF 6 Pressure chamber specification control drawings (JH) DC Gun cathode cooling design for Karl S. Cornell (JH) DC Gun stands (JH) DC Gun to Booster SRF booster cavity beam line (JH) DC Gun cathode insertion drive (WJ/VDM) DC Gun cathode coating system vacuum chamber (PC) DC Gun cathode transfer load lock and vacuum chamber (WJ) Cathode production coating system design (BM) Low Energy RHIC electron Cooling
LERe. C Design Room Other Work RHIC 1: 00 move real estate drawings (V. DM. ) Phase 2: 5 cell cavity positioning (RM) – Revised Position on hold Phase 1 and 2 cryogenic system layout (RM) 2. 1 GHz warm cavity fabrication drawings (MG) 704 MHz warm cavity fabrication drawings Transport & Merger line layout (RM/VDM) Transport & Merger Line Layout Transport & Merger Line Solenoids Transport & Merger Line BPM’s Transport & Merger Line Profile Monitors Low Energy RHIC electron Cooling
Installation Step – 2015 Shutdown Cooling Section Purchase Orders in Place • HF and LF solenoid magnets in fabrication, 1 st article in transit • Shielded vacuum valves, bellows, tuning (sliding) bellows, gauges? • Beam tubes being coated • BPM chambers and buttons ordered FDR approved • 20 o merger magnets • Beamline shielded bellow and 180 o magnet sliding bellows • Profile monitor and emittance slit vacuum linear drives Cooling Section Critical Items (not ordered yet) • 20 o magnet vacuum chamber (MM preparing RFQ) • Special RF vacuum gaskets • Diagnostics chambers & hardware: PM, ES, PM/ES/BPM • Beamline equipment stands • 180 o magnet (spectrometer magnet – moved to 2016) 25
Installation Step – 2015 Shutdown Punchlist Cooling Section Parts in Hand • 5 of 15 LF solenoid magnets • 5” beam tubes and flanges • Shielded vacuum valves 26
Reference Slides 27
Freeze Cooling Section? ? Low Energy RHIC electron Cooling
20 o Dipole Magnet Neighborhood Low Energy RHIC electron Cooling
180 o Dipole Magnet Neighborhood II Aperture Transitions Low Energy RHIC electron Cooling
LERe. C Dipole Skew Quad Corrector Window-frame Skew Quad: 100 A-turn per corner = s-quad gradient 3. 19 G/cm or, 3. 19 E-2 T/m Current polarities: • Opposite corners have the same polarity • Adjacent corners have the opposite polarities. Low Energy RHIC electron Cooling
Transport Line Matching Solenoid Transport Solenoid (preliminary) ----- to be mounted on 2. 5” pipe (Copper winding starts at R=2”) 1. 27 cm (thickness) By using #5 square wire Io = 17. 77 A N = 720 (60 turns along Z-axis; 12 layers along R) Total 12792. 7 A-turn 14. 8 Overall J =-73. 501 (A/cm 2) Bo = 535. 4 G Bz** integral = 7. 27 E 6 G 2 -cm R [cm] 5. 08 Effective Lm = 29. 5 cm 16. 84 Low Energy RHIC electron Cooling
Transport Line Merging Solenoid (preliminary) ----- to be mounted on 2. 5” pipe (Copper winding starts at R=2”) 1. 27 cm (thickness) 14. 8 J = -75 A/cm 2 (Overall) By using #5 square wire Io = 18. 13 A N = 1140 (60 turns along Z-axis; 24 layers along R) Total 26112 A-turn Bo = 1088. 39 G Bz** integral = 3. 06 E 7 G 2 -cm Effective Lm = 30. 14 cm R [cm] 5. 08 16. 84 Low Energy RHIC electron Cooling
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